Lennox International Inc. GWB9-050IH-2 Manuel D’Utilisation

2” (50.8mm) DIAMETER VENT AND 

COMBUSTION AIR INTAKE PIPING 
- 21 feet maximum total equivalent 

length for 90-100 models
-26 feet maximum total equivalent 

length for 90-50 and -90-75 models
- 2 feet minimum total equivalent 

length for all models

TRANSITION FITTING 
2” (50.8mm) 

⊘ to 3” (76.2mm) 

⊘ IN VERTICAL RUN

3” (76.2mm) DIAMETER VENT AND 

COMBUSTION AIR INTAKE PIPING
- 92 feet maximum total equivalent length 

for 90-100 models
- 15 feet minimum total equivalent length 

for 90-100 models
- 112 feet maximum total equivalent length 

for 90-50 and 90-75 models
- 20 feet minimum total equivalent length 

for 90-50 and 90-75 models